1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * linux/fs/ext2/super.c |
4 | * |
5 | * Copyright (C) 1992, 1993, 1994, 1995 |
6 | * Remy Card (card@masi.ibp.fr) |
7 | * Laboratoire MASI - Institut Blaise Pascal |
8 | * Universite Pierre et Marie Curie (Paris VI) |
9 | * |
10 | * from |
11 | * |
12 | * linux/fs/minix/inode.c |
13 | * |
14 | * Copyright (C) 1991, 1992 Linus Torvalds |
15 | * |
16 | * Big-endian to little-endian byte-swapping/bitmaps by |
17 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
18 | */ |
19 | |
20 | #include <linux/module.h> |
21 | #include <linux/string.h> |
22 | #include <linux/fs.h> |
23 | #include <linux/slab.h> |
24 | #include <linux/init.h> |
25 | #include <linux/blkdev.h> |
26 | #include <linux/parser.h> |
27 | #include <linux/random.h> |
28 | #include <linux/buffer_head.h> |
29 | #include <linux/exportfs.h> |
30 | #include <linux/vfs.h> |
31 | #include <linux/seq_file.h> |
32 | #include <linux/mount.h> |
33 | #include <linux/log2.h> |
34 | #include <linux/quotaops.h> |
35 | #include <linux/uaccess.h> |
36 | #include <linux/dax.h> |
37 | #include <linux/iversion.h> |
38 | #include "ext2.h" |
39 | #include "xattr.h" |
40 | #include "acl.h" |
41 | |
42 | static void ext2_write_super(struct super_block *sb); |
43 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
44 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
45 | static int ext2_sync_fs(struct super_block *sb, int wait); |
46 | static int ext2_freeze(struct super_block *sb); |
47 | static int ext2_unfreeze(struct super_block *sb); |
48 | |
49 | void ext2_error(struct super_block *sb, const char *function, |
50 | const char *fmt, ...) |
51 | { |
52 | struct va_format vaf; |
53 | va_list args; |
54 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
55 | struct ext2_super_block *es = sbi->s_es; |
56 | |
57 | if (!sb_rdonly(sb)) { |
58 | spin_lock(lock: &sbi->s_lock); |
59 | sbi->s_mount_state |= EXT2_ERROR_FS; |
60 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
61 | spin_unlock(lock: &sbi->s_lock); |
62 | ext2_sync_super(sb, es, wait: 1); |
63 | } |
64 | |
65 | va_start(args, fmt); |
66 | |
67 | vaf.fmt = fmt; |
68 | vaf.va = &args; |
69 | |
70 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n" , |
71 | sb->s_id, function, &vaf); |
72 | |
73 | va_end(args); |
74 | |
75 | if (test_opt(sb, ERRORS_PANIC)) |
76 | panic(fmt: "EXT2-fs: panic from previous error\n" ); |
77 | if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { |
78 | ext2_msg(sb, KERN_CRIT, |
79 | "error: remounting filesystem read-only" ); |
80 | sb->s_flags |= SB_RDONLY; |
81 | } |
82 | } |
83 | |
84 | void ext2_msg(struct super_block *sb, const char *prefix, |
85 | const char *fmt, ...) |
86 | { |
87 | struct va_format vaf; |
88 | va_list args; |
89 | |
90 | va_start(args, fmt); |
91 | |
92 | vaf.fmt = fmt; |
93 | vaf.va = &args; |
94 | |
95 | printk("%sEXT2-fs (%s): %pV\n" , prefix, sb->s_id, &vaf); |
96 | |
97 | va_end(args); |
98 | } |
99 | |
100 | /* |
101 | * This must be called with sbi->s_lock held. |
102 | */ |
103 | void ext2_update_dynamic_rev(struct super_block *sb) |
104 | { |
105 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
106 | |
107 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
108 | return; |
109 | |
110 | ext2_msg(sb, KERN_WARNING, |
111 | fmt: "warning: updating to rev %d because of " |
112 | "new feature flag, running e2fsck is recommended" , |
113 | EXT2_DYNAMIC_REV); |
114 | |
115 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
116 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
117 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); |
118 | /* leave es->s_feature_*compat flags alone */ |
119 | /* es->s_uuid will be set by e2fsck if empty */ |
120 | |
121 | /* |
122 | * The rest of the superblock fields should be zero, and if not it |
123 | * means they are likely already in use, so leave them alone. We |
124 | * can leave it up to e2fsck to clean up any inconsistencies there. |
125 | */ |
126 | } |
127 | |
128 | #ifdef CONFIG_QUOTA |
129 | static int ext2_quota_off(struct super_block *sb, int type); |
130 | |
131 | static void ext2_quota_off_umount(struct super_block *sb) |
132 | { |
133 | int type; |
134 | |
135 | for (type = 0; type < MAXQUOTAS; type++) |
136 | ext2_quota_off(sb, type); |
137 | } |
138 | #else |
139 | static inline void ext2_quota_off_umount(struct super_block *sb) |
140 | { |
141 | } |
142 | #endif |
143 | |
144 | static void ext2_put_super (struct super_block * sb) |
145 | { |
146 | int db_count; |
147 | int i; |
148 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
149 | |
150 | ext2_quota_off_umount(sb); |
151 | |
152 | ext2_xattr_destroy_cache(cache: sbi->s_ea_block_cache); |
153 | sbi->s_ea_block_cache = NULL; |
154 | |
155 | if (!sb_rdonly(sb)) { |
156 | struct ext2_super_block *es = sbi->s_es; |
157 | |
158 | spin_lock(lock: &sbi->s_lock); |
159 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
160 | spin_unlock(lock: &sbi->s_lock); |
161 | ext2_sync_super(sb, es, wait: 1); |
162 | } |
163 | db_count = sbi->s_gdb_count; |
164 | for (i = 0; i < db_count; i++) |
165 | brelse(bh: sbi->s_group_desc[i]); |
166 | kvfree(addr: sbi->s_group_desc); |
167 | kfree(objp: sbi->s_debts); |
168 | percpu_counter_destroy(fbc: &sbi->s_freeblocks_counter); |
169 | percpu_counter_destroy(fbc: &sbi->s_freeinodes_counter); |
170 | percpu_counter_destroy(fbc: &sbi->s_dirs_counter); |
171 | brelse (bh: sbi->s_sbh); |
172 | sb->s_fs_info = NULL; |
173 | kfree(objp: sbi->s_blockgroup_lock); |
174 | fs_put_dax(dax_dev: sbi->s_daxdev, NULL); |
175 | kfree(objp: sbi); |
176 | } |
177 | |
178 | static struct kmem_cache * ext2_inode_cachep; |
179 | |
180 | static struct inode *ext2_alloc_inode(struct super_block *sb) |
181 | { |
182 | struct ext2_inode_info *ei; |
183 | ei = alloc_inode_sb(sb, cache: ext2_inode_cachep, GFP_KERNEL); |
184 | if (!ei) |
185 | return NULL; |
186 | ei->i_block_alloc_info = NULL; |
187 | inode_set_iversion(inode: &ei->vfs_inode, val: 1); |
188 | #ifdef CONFIG_QUOTA |
189 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); |
190 | #endif |
191 | |
192 | return &ei->vfs_inode; |
193 | } |
194 | |
195 | static void ext2_free_in_core_inode(struct inode *inode) |
196 | { |
197 | kmem_cache_free(s: ext2_inode_cachep, objp: EXT2_I(inode)); |
198 | } |
199 | |
200 | static void init_once(void *foo) |
201 | { |
202 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
203 | |
204 | rwlock_init(&ei->i_meta_lock); |
205 | #ifdef CONFIG_EXT2_FS_XATTR |
206 | init_rwsem(&ei->xattr_sem); |
207 | #endif |
208 | mutex_init(&ei->truncate_mutex); |
209 | inode_init_once(&ei->vfs_inode); |
210 | } |
211 | |
212 | static int __init init_inodecache(void) |
213 | { |
214 | ext2_inode_cachep = kmem_cache_create_usercopy(name: "ext2_inode_cache" , |
215 | size: sizeof(struct ext2_inode_info), align: 0, |
216 | SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT, |
217 | offsetof(struct ext2_inode_info, i_data), |
218 | sizeof_field(struct ext2_inode_info, i_data), |
219 | ctor: init_once); |
220 | if (ext2_inode_cachep == NULL) |
221 | return -ENOMEM; |
222 | return 0; |
223 | } |
224 | |
225 | static void destroy_inodecache(void) |
226 | { |
227 | /* |
228 | * Make sure all delayed rcu free inodes are flushed before we |
229 | * destroy cache. |
230 | */ |
231 | rcu_barrier(); |
232 | kmem_cache_destroy(s: ext2_inode_cachep); |
233 | } |
234 | |
235 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
236 | { |
237 | struct super_block *sb = root->d_sb; |
238 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
239 | struct ext2_super_block *es = sbi->s_es; |
240 | unsigned long def_mount_opts; |
241 | |
242 | spin_lock(lock: &sbi->s_lock); |
243 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
244 | |
245 | if (sbi->s_sb_block != 1) |
246 | seq_printf(m: seq, fmt: ",sb=%lu" , sbi->s_sb_block); |
247 | if (test_opt(sb, MINIX_DF)) |
248 | seq_puts(m: seq, s: ",minixdf" ); |
249 | if (test_opt(sb, GRPID)) |
250 | seq_puts(m: seq, s: ",grpid" ); |
251 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
252 | seq_puts(m: seq, s: ",nogrpid" ); |
253 | if (!uid_eq(left: sbi->s_resuid, right: make_kuid(from: &init_user_ns, EXT2_DEF_RESUID)) || |
254 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
255 | seq_printf(m: seq, fmt: ",resuid=%u" , |
256 | from_kuid_munged(to: &init_user_ns, uid: sbi->s_resuid)); |
257 | } |
258 | if (!gid_eq(left: sbi->s_resgid, right: make_kgid(from: &init_user_ns, EXT2_DEF_RESGID)) || |
259 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
260 | seq_printf(m: seq, fmt: ",resgid=%u" , |
261 | from_kgid_munged(to: &init_user_ns, gid: sbi->s_resgid)); |
262 | } |
263 | if (test_opt(sb, ERRORS_RO)) { |
264 | int def_errors = le16_to_cpu(es->s_errors); |
265 | |
266 | if (def_errors == EXT2_ERRORS_PANIC || |
267 | def_errors == EXT2_ERRORS_CONTINUE) { |
268 | seq_puts(m: seq, s: ",errors=remount-ro" ); |
269 | } |
270 | } |
271 | if (test_opt(sb, ERRORS_CONT)) |
272 | seq_puts(m: seq, s: ",errors=continue" ); |
273 | if (test_opt(sb, ERRORS_PANIC)) |
274 | seq_puts(m: seq, s: ",errors=panic" ); |
275 | if (test_opt(sb, NO_UID32)) |
276 | seq_puts(m: seq, s: ",nouid32" ); |
277 | if (test_opt(sb, DEBUG)) |
278 | seq_puts(m: seq, s: ",debug" ); |
279 | if (test_opt(sb, OLDALLOC)) |
280 | seq_puts(m: seq, s: ",oldalloc" ); |
281 | |
282 | #ifdef CONFIG_EXT2_FS_XATTR |
283 | if (test_opt(sb, XATTR_USER)) |
284 | seq_puts(m: seq, s: ",user_xattr" ); |
285 | if (!test_opt(sb, XATTR_USER) && |
286 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { |
287 | seq_puts(m: seq, s: ",nouser_xattr" ); |
288 | } |
289 | #endif |
290 | |
291 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
292 | if (test_opt(sb, POSIX_ACL)) |
293 | seq_puts(m: seq, s: ",acl" ); |
294 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) |
295 | seq_puts(m: seq, s: ",noacl" ); |
296 | #endif |
297 | |
298 | if (test_opt(sb, USRQUOTA)) |
299 | seq_puts(m: seq, s: ",usrquota" ); |
300 | |
301 | if (test_opt(sb, GRPQUOTA)) |
302 | seq_puts(m: seq, s: ",grpquota" ); |
303 | |
304 | if (test_opt(sb, XIP)) |
305 | seq_puts(m: seq, s: ",xip" ); |
306 | |
307 | if (test_opt(sb, DAX)) |
308 | seq_puts(m: seq, s: ",dax" ); |
309 | |
310 | if (!test_opt(sb, RESERVATION)) |
311 | seq_puts(m: seq, s: ",noreservation" ); |
312 | |
313 | spin_unlock(lock: &sbi->s_lock); |
314 | return 0; |
315 | } |
316 | |
317 | #ifdef CONFIG_QUOTA |
318 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
319 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
320 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
321 | const struct path *path); |
322 | static struct dquot __rcu **ext2_get_dquots(struct inode *inode) |
323 | { |
324 | return EXT2_I(inode)->i_dquot; |
325 | } |
326 | |
327 | static const struct quotactl_ops ext2_quotactl_ops = { |
328 | .quota_on = ext2_quota_on, |
329 | .quota_off = ext2_quota_off, |
330 | .quota_sync = dquot_quota_sync, |
331 | .get_state = dquot_get_state, |
332 | .set_info = dquot_set_dqinfo, |
333 | .get_dqblk = dquot_get_dqblk, |
334 | .set_dqblk = dquot_set_dqblk, |
335 | .get_nextdqblk = dquot_get_next_dqblk, |
336 | }; |
337 | #endif |
338 | |
339 | static const struct super_operations ext2_sops = { |
340 | .alloc_inode = ext2_alloc_inode, |
341 | .free_inode = ext2_free_in_core_inode, |
342 | .write_inode = ext2_write_inode, |
343 | .evict_inode = ext2_evict_inode, |
344 | .put_super = ext2_put_super, |
345 | .sync_fs = ext2_sync_fs, |
346 | .freeze_fs = ext2_freeze, |
347 | .unfreeze_fs = ext2_unfreeze, |
348 | .statfs = ext2_statfs, |
349 | .remount_fs = ext2_remount, |
350 | .show_options = ext2_show_options, |
351 | #ifdef CONFIG_QUOTA |
352 | .quota_read = ext2_quota_read, |
353 | .quota_write = ext2_quota_write, |
354 | .get_dquots = ext2_get_dquots, |
355 | #endif |
356 | }; |
357 | |
358 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
359 | u64 ino, u32 generation) |
360 | { |
361 | struct inode *inode; |
362 | |
363 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) |
364 | return ERR_PTR(error: -ESTALE); |
365 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) |
366 | return ERR_PTR(error: -ESTALE); |
367 | |
368 | /* |
369 | * ext2_iget isn't quite right if the inode is currently unallocated! |
370 | * However ext2_iget currently does appropriate checks to handle stale |
371 | * inodes so everything is OK. |
372 | */ |
373 | inode = ext2_iget(sb, ino); |
374 | if (IS_ERR(ptr: inode)) |
375 | return ERR_CAST(ptr: inode); |
376 | if (generation && inode->i_generation != generation) { |
377 | /* we didn't find the right inode.. */ |
378 | iput(inode); |
379 | return ERR_PTR(error: -ESTALE); |
380 | } |
381 | return inode; |
382 | } |
383 | |
384 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
385 | int fh_len, int fh_type) |
386 | { |
387 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
388 | get_inode: ext2_nfs_get_inode); |
389 | } |
390 | |
391 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, |
392 | int fh_len, int fh_type) |
393 | { |
394 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
395 | get_inode: ext2_nfs_get_inode); |
396 | } |
397 | |
398 | static const struct export_operations ext2_export_ops = { |
399 | .encode_fh = generic_encode_ino32_fh, |
400 | .fh_to_dentry = ext2_fh_to_dentry, |
401 | .fh_to_parent = ext2_fh_to_parent, |
402 | .get_parent = ext2_get_parent, |
403 | }; |
404 | |
405 | static unsigned long get_sb_block(void **data) |
406 | { |
407 | unsigned long sb_block; |
408 | char *options = (char *) *data; |
409 | |
410 | if (!options || strncmp(options, "sb=" , 3) != 0) |
411 | return 1; /* Default location */ |
412 | options += 3; |
413 | sb_block = simple_strtoul(options, &options, 0); |
414 | if (*options && *options != ',') { |
415 | printk("EXT2-fs: Invalid sb specification: %s\n" , |
416 | (char *) *data); |
417 | return 1; |
418 | } |
419 | if (*options == ',') |
420 | options++; |
421 | *data = (void *) options; |
422 | return sb_block; |
423 | } |
424 | |
425 | enum { |
426 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
427 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
428 | Opt_err_ro, Opt_nouid32, Opt_debug, |
429 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
430 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
431 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
432 | }; |
433 | |
434 | static const match_table_t tokens = { |
435 | {Opt_bsd_df, "bsddf" }, |
436 | {Opt_minix_df, "minixdf" }, |
437 | {Opt_grpid, "grpid" }, |
438 | {Opt_grpid, "bsdgroups" }, |
439 | {Opt_nogrpid, "nogrpid" }, |
440 | {Opt_nogrpid, "sysvgroups" }, |
441 | {Opt_resgid, "resgid=%u" }, |
442 | {Opt_resuid, "resuid=%u" }, |
443 | {Opt_sb, "sb=%u" }, |
444 | {Opt_err_cont, "errors=continue" }, |
445 | {Opt_err_panic, "errors=panic" }, |
446 | {Opt_err_ro, "errors=remount-ro" }, |
447 | {Opt_nouid32, "nouid32" }, |
448 | {Opt_debug, "debug" }, |
449 | {Opt_oldalloc, "oldalloc" }, |
450 | {Opt_orlov, "orlov" }, |
451 | {Opt_nobh, "nobh" }, |
452 | {Opt_user_xattr, "user_xattr" }, |
453 | {Opt_nouser_xattr, "nouser_xattr" }, |
454 | {Opt_acl, "acl" }, |
455 | {Opt_noacl, "noacl" }, |
456 | {Opt_xip, "xip" }, |
457 | {Opt_dax, "dax" }, |
458 | {Opt_grpquota, "grpquota" }, |
459 | {Opt_ignore, "noquota" }, |
460 | {Opt_quota, "quota" }, |
461 | {Opt_usrquota, "usrquota" }, |
462 | {Opt_reservation, "reservation" }, |
463 | {Opt_noreservation, "noreservation" }, |
464 | {Opt_err, NULL} |
465 | }; |
466 | |
467 | static int parse_options(char *options, struct super_block *sb, |
468 | struct ext2_mount_options *opts) |
469 | { |
470 | char *p; |
471 | substring_t args[MAX_OPT_ARGS]; |
472 | int option; |
473 | kuid_t uid; |
474 | kgid_t gid; |
475 | |
476 | if (!options) |
477 | return 1; |
478 | |
479 | while ((p = strsep (&options, "," )) != NULL) { |
480 | int token; |
481 | if (!*p) |
482 | continue; |
483 | |
484 | token = match_token(p, table: tokens, args); |
485 | switch (token) { |
486 | case Opt_bsd_df: |
487 | clear_opt (opts->s_mount_opt, MINIX_DF); |
488 | break; |
489 | case Opt_minix_df: |
490 | set_opt (opts->s_mount_opt, MINIX_DF); |
491 | break; |
492 | case Opt_grpid: |
493 | set_opt (opts->s_mount_opt, GRPID); |
494 | break; |
495 | case Opt_nogrpid: |
496 | clear_opt (opts->s_mount_opt, GRPID); |
497 | break; |
498 | case Opt_resuid: |
499 | if (match_int(&args[0], result: &option)) |
500 | return 0; |
501 | uid = make_kuid(current_user_ns(), uid: option); |
502 | if (!uid_valid(uid)) { |
503 | ext2_msg(sb, KERN_ERR, fmt: "Invalid uid value %d" , option); |
504 | return 0; |
505 | |
506 | } |
507 | opts->s_resuid = uid; |
508 | break; |
509 | case Opt_resgid: |
510 | if (match_int(&args[0], result: &option)) |
511 | return 0; |
512 | gid = make_kgid(current_user_ns(), gid: option); |
513 | if (!gid_valid(gid)) { |
514 | ext2_msg(sb, KERN_ERR, fmt: "Invalid gid value %d" , option); |
515 | return 0; |
516 | } |
517 | opts->s_resgid = gid; |
518 | break; |
519 | case Opt_sb: |
520 | /* handled by get_sb_block() instead of here */ |
521 | /* *sb_block = match_int(&args[0]); */ |
522 | break; |
523 | case Opt_err_panic: |
524 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
525 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
526 | set_opt (opts->s_mount_opt, ERRORS_PANIC); |
527 | break; |
528 | case Opt_err_ro: |
529 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
530 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
531 | set_opt (opts->s_mount_opt, ERRORS_RO); |
532 | break; |
533 | case Opt_err_cont: |
534 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
535 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
536 | set_opt (opts->s_mount_opt, ERRORS_CONT); |
537 | break; |
538 | case Opt_nouid32: |
539 | set_opt (opts->s_mount_opt, NO_UID32); |
540 | break; |
541 | case Opt_debug: |
542 | set_opt (opts->s_mount_opt, DEBUG); |
543 | break; |
544 | case Opt_oldalloc: |
545 | set_opt (opts->s_mount_opt, OLDALLOC); |
546 | break; |
547 | case Opt_orlov: |
548 | clear_opt (opts->s_mount_opt, OLDALLOC); |
549 | break; |
550 | case Opt_nobh: |
551 | ext2_msg(sb, KERN_INFO, |
552 | fmt: "nobh option not supported" ); |
553 | break; |
554 | #ifdef CONFIG_EXT2_FS_XATTR |
555 | case Opt_user_xattr: |
556 | set_opt (opts->s_mount_opt, XATTR_USER); |
557 | break; |
558 | case Opt_nouser_xattr: |
559 | clear_opt (opts->s_mount_opt, XATTR_USER); |
560 | break; |
561 | #else |
562 | case Opt_user_xattr: |
563 | case Opt_nouser_xattr: |
564 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
565 | "not supported" ); |
566 | break; |
567 | #endif |
568 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
569 | case Opt_acl: |
570 | set_opt(opts->s_mount_opt, POSIX_ACL); |
571 | break; |
572 | case Opt_noacl: |
573 | clear_opt(opts->s_mount_opt, POSIX_ACL); |
574 | break; |
575 | #else |
576 | case Opt_acl: |
577 | case Opt_noacl: |
578 | ext2_msg(sb, KERN_INFO, |
579 | "(no)acl options not supported" ); |
580 | break; |
581 | #endif |
582 | case Opt_xip: |
583 | ext2_msg(sb, KERN_INFO, fmt: "use dax instead of xip" ); |
584 | set_opt(opts->s_mount_opt, XIP); |
585 | fallthrough; |
586 | case Opt_dax: |
587 | #ifdef CONFIG_FS_DAX |
588 | ext2_msg(sb, KERN_WARNING, |
589 | fmt: "DAX enabled. Warning: EXPERIMENTAL, use at your own risk" ); |
590 | set_opt(opts->s_mount_opt, DAX); |
591 | #else |
592 | ext2_msg(sb, KERN_INFO, "dax option not supported" ); |
593 | #endif |
594 | break; |
595 | |
596 | #if defined(CONFIG_QUOTA) |
597 | case Opt_quota: |
598 | case Opt_usrquota: |
599 | set_opt(opts->s_mount_opt, USRQUOTA); |
600 | break; |
601 | |
602 | case Opt_grpquota: |
603 | set_opt(opts->s_mount_opt, GRPQUOTA); |
604 | break; |
605 | #else |
606 | case Opt_quota: |
607 | case Opt_usrquota: |
608 | case Opt_grpquota: |
609 | ext2_msg(sb, KERN_INFO, |
610 | "quota operations not supported" ); |
611 | break; |
612 | #endif |
613 | |
614 | case Opt_reservation: |
615 | set_opt(opts->s_mount_opt, RESERVATION); |
616 | ext2_msg(sb, KERN_INFO, fmt: "reservations ON" ); |
617 | break; |
618 | case Opt_noreservation: |
619 | clear_opt(opts->s_mount_opt, RESERVATION); |
620 | ext2_msg(sb, KERN_INFO, fmt: "reservations OFF" ); |
621 | break; |
622 | case Opt_ignore: |
623 | break; |
624 | default: |
625 | return 0; |
626 | } |
627 | } |
628 | return 1; |
629 | } |
630 | |
631 | static int ext2_setup_super (struct super_block * sb, |
632 | struct ext2_super_block * es, |
633 | int read_only) |
634 | { |
635 | int res = 0; |
636 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
637 | |
638 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
639 | ext2_msg(sb, KERN_ERR, |
640 | fmt: "error: revision level too high, " |
641 | "forcing read-only mode" ); |
642 | res = SB_RDONLY; |
643 | } |
644 | if (read_only) |
645 | return res; |
646 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
647 | ext2_msg(sb, KERN_WARNING, |
648 | fmt: "warning: mounting unchecked fs, " |
649 | "running e2fsck is recommended" ); |
650 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
651 | ext2_msg(sb, KERN_WARNING, |
652 | fmt: "warning: mounting fs with errors, " |
653 | "running e2fsck is recommended" ); |
654 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
655 | le16_to_cpu(es->s_mnt_count) >= |
656 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
657 | ext2_msg(sb, KERN_WARNING, |
658 | fmt: "warning: maximal mount count reached, " |
659 | "running e2fsck is recommended" ); |
660 | else if (le32_to_cpu(es->s_checkinterval) && |
661 | (le32_to_cpu(es->s_lastcheck) + |
662 | le32_to_cpu(es->s_checkinterval) <= |
663 | ktime_get_real_seconds())) |
664 | ext2_msg(sb, KERN_WARNING, |
665 | fmt: "warning: checktime reached, " |
666 | "running e2fsck is recommended" ); |
667 | if (!le16_to_cpu(es->s_max_mnt_count)) |
668 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); |
669 | le16_add_cpu(var: &es->s_mnt_count, val: 1); |
670 | if (test_opt (sb, DEBUG)) |
671 | ext2_msg(sb, KERN_INFO, fmt: "%s, %s, bs=%lu, gc=%lu, " |
672 | "bpg=%lu, ipg=%lu, mo=%04lx]" , |
673 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
674 | sbi->s_groups_count, |
675 | EXT2_BLOCKS_PER_GROUP(sb), |
676 | EXT2_INODES_PER_GROUP(sb), |
677 | sbi->s_mount_opt); |
678 | return res; |
679 | } |
680 | |
681 | static int ext2_check_descriptors(struct super_block *sb) |
682 | { |
683 | int i; |
684 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
685 | |
686 | ext2_debug ("Checking group descriptors" ); |
687 | |
688 | for (i = 0; i < sbi->s_groups_count; i++) { |
689 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, block_group: i, NULL); |
690 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, group_no: i); |
691 | ext2_fsblk_t last_block = ext2_group_last_block_no(sb, group_no: i); |
692 | |
693 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
694 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
695 | { |
696 | ext2_error (sb, function: "ext2_check_descriptors" , |
697 | fmt: "Block bitmap for group %d" |
698 | " not in group (block %lu)!" , |
699 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
700 | return 0; |
701 | } |
702 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
703 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
704 | { |
705 | ext2_error (sb, function: "ext2_check_descriptors" , |
706 | fmt: "Inode bitmap for group %d" |
707 | " not in group (block %lu)!" , |
708 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
709 | return 0; |
710 | } |
711 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
712 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
713 | last_block) |
714 | { |
715 | ext2_error (sb, function: "ext2_check_descriptors" , |
716 | fmt: "Inode table for group %d" |
717 | " not in group (block %lu)!" , |
718 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
719 | return 0; |
720 | } |
721 | } |
722 | return 1; |
723 | } |
724 | |
725 | /* |
726 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
727 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
728 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
729 | */ |
730 | static loff_t ext2_max_size(int bits) |
731 | { |
732 | loff_t res = EXT2_NDIR_BLOCKS; |
733 | int meta_blocks; |
734 | unsigned int upper_limit; |
735 | unsigned int ppb = 1 << (bits-2); |
736 | |
737 | /* This is calculated to be the largest file size for a |
738 | * dense, file such that the total number of |
739 | * sectors in the file, including data and all indirect blocks, |
740 | * does not exceed 2^32 -1 |
741 | * __u32 i_blocks representing the total number of |
742 | * 512 bytes blocks of the file |
743 | */ |
744 | upper_limit = (1LL << 32) - 1; |
745 | |
746 | /* total blocks in file system block size */ |
747 | upper_limit >>= (bits - 9); |
748 | |
749 | /* Compute how many blocks we can address by block tree */ |
750 | res += 1LL << (bits-2); |
751 | res += 1LL << (2*(bits-2)); |
752 | res += 1LL << (3*(bits-2)); |
753 | /* Compute how many metadata blocks are needed */ |
754 | meta_blocks = 1; |
755 | meta_blocks += 1 + ppb; |
756 | meta_blocks += 1 + ppb + ppb * ppb; |
757 | /* Does block tree limit file size? */ |
758 | if (res + meta_blocks <= upper_limit) |
759 | goto check_lfs; |
760 | |
761 | res = upper_limit; |
762 | /* How many metadata blocks are needed for addressing upper_limit? */ |
763 | upper_limit -= EXT2_NDIR_BLOCKS; |
764 | /* indirect blocks */ |
765 | meta_blocks = 1; |
766 | upper_limit -= ppb; |
767 | /* double indirect blocks */ |
768 | if (upper_limit < ppb * ppb) { |
769 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); |
770 | res -= meta_blocks; |
771 | goto check_lfs; |
772 | } |
773 | meta_blocks += 1 + ppb; |
774 | upper_limit -= ppb * ppb; |
775 | /* tripple indirect blocks for the rest */ |
776 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + |
777 | DIV_ROUND_UP(upper_limit, ppb*ppb); |
778 | res -= meta_blocks; |
779 | check_lfs: |
780 | res <<= bits; |
781 | if (res > MAX_LFS_FILESIZE) |
782 | res = MAX_LFS_FILESIZE; |
783 | |
784 | return res; |
785 | } |
786 | |
787 | static unsigned long descriptor_loc(struct super_block *sb, |
788 | unsigned long logic_sb_block, |
789 | int nr) |
790 | { |
791 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
792 | unsigned long bg, first_meta_bg; |
793 | |
794 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
795 | |
796 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
797 | nr < first_meta_bg) |
798 | return (logic_sb_block + nr + 1); |
799 | bg = sbi->s_desc_per_block * nr; |
800 | |
801 | return ext2_group_first_block_no(sb, group_no: bg) + ext2_bg_has_super(sb, group: bg); |
802 | } |
803 | |
804 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
805 | { |
806 | struct buffer_head * bh; |
807 | struct ext2_sb_info * sbi; |
808 | struct ext2_super_block * es; |
809 | struct inode *root; |
810 | unsigned long block; |
811 | unsigned long sb_block = get_sb_block(data: &data); |
812 | unsigned long logic_sb_block; |
813 | unsigned long offset = 0; |
814 | unsigned long def_mount_opts; |
815 | long ret = -ENOMEM; |
816 | int blocksize = BLOCK_SIZE; |
817 | int db_count; |
818 | int i, j; |
819 | __le32 features; |
820 | int err; |
821 | struct ext2_mount_options opts; |
822 | |
823 | sbi = kzalloc(size: sizeof(*sbi), GFP_KERNEL); |
824 | if (!sbi) |
825 | return -ENOMEM; |
826 | |
827 | sbi->s_blockgroup_lock = |
828 | kzalloc(size: sizeof(struct blockgroup_lock), GFP_KERNEL); |
829 | if (!sbi->s_blockgroup_lock) { |
830 | kfree(objp: sbi); |
831 | return -ENOMEM; |
832 | } |
833 | sb->s_fs_info = sbi; |
834 | sbi->s_sb_block = sb_block; |
835 | sbi->s_daxdev = fs_dax_get_by_bdev(bdev: sb->s_bdev, start_off: &sbi->s_dax_part_off, |
836 | NULL, NULL); |
837 | |
838 | spin_lock_init(&sbi->s_lock); |
839 | ret = -EINVAL; |
840 | |
841 | /* |
842 | * See what the current blocksize for the device is, and |
843 | * use that as the blocksize. Otherwise (or if the blocksize |
844 | * is smaller than the default) use the default. |
845 | * This is important for devices that have a hardware |
846 | * sectorsize that is larger than the default. |
847 | */ |
848 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
849 | if (!blocksize) { |
850 | ext2_msg(sb, KERN_ERR, fmt: "error: unable to set blocksize" ); |
851 | goto failed_sbi; |
852 | } |
853 | |
854 | /* |
855 | * If the superblock doesn't start on a hardware sector boundary, |
856 | * calculate the offset. |
857 | */ |
858 | if (blocksize != BLOCK_SIZE) { |
859 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
860 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
861 | } else { |
862 | logic_sb_block = sb_block; |
863 | } |
864 | |
865 | if (!(bh = sb_bread(sb, block: logic_sb_block))) { |
866 | ext2_msg(sb, KERN_ERR, fmt: "error: unable to read superblock" ); |
867 | goto failed_sbi; |
868 | } |
869 | /* |
870 | * Note: s_es must be initialized as soon as possible because |
871 | * some ext2 macro-instructions depend on its value |
872 | */ |
873 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
874 | sbi->s_es = es; |
875 | sb->s_magic = le16_to_cpu(es->s_magic); |
876 | |
877 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
878 | goto cantfind_ext2; |
879 | |
880 | opts.s_mount_opt = 0; |
881 | /* Set defaults before we parse the mount options */ |
882 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
883 | if (def_mount_opts & EXT2_DEFM_DEBUG) |
884 | set_opt(opts.s_mount_opt, DEBUG); |
885 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
886 | set_opt(opts.s_mount_opt, GRPID); |
887 | if (def_mount_opts & EXT2_DEFM_UID16) |
888 | set_opt(opts.s_mount_opt, NO_UID32); |
889 | #ifdef CONFIG_EXT2_FS_XATTR |
890 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
891 | set_opt(opts.s_mount_opt, XATTR_USER); |
892 | #endif |
893 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
894 | if (def_mount_opts & EXT2_DEFM_ACL) |
895 | set_opt(opts.s_mount_opt, POSIX_ACL); |
896 | #endif |
897 | |
898 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
899 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
900 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
901 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
902 | else |
903 | set_opt(opts.s_mount_opt, ERRORS_RO); |
904 | |
905 | opts.s_resuid = make_kuid(from: &init_user_ns, le16_to_cpu(es->s_def_resuid)); |
906 | opts.s_resgid = make_kgid(from: &init_user_ns, le16_to_cpu(es->s_def_resgid)); |
907 | |
908 | set_opt(opts.s_mount_opt, RESERVATION); |
909 | |
910 | if (!parse_options(options: (char *) data, sb, opts: &opts)) |
911 | goto failed_mount; |
912 | |
913 | sbi->s_mount_opt = opts.s_mount_opt; |
914 | sbi->s_resuid = opts.s_resuid; |
915 | sbi->s_resgid = opts.s_resgid; |
916 | |
917 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
918 | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
919 | sb->s_iflags |= SB_I_CGROUPWB; |
920 | |
921 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
922 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
923 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
924 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
925 | ext2_msg(sb, KERN_WARNING, |
926 | fmt: "warning: feature flags set on rev 0 fs, " |
927 | "running e2fsck is recommended" ); |
928 | /* |
929 | * Check feature flags regardless of the revision level, since we |
930 | * previously didn't change the revision level when setting the flags, |
931 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
932 | */ |
933 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
934 | if (features) { |
935 | ext2_msg(sb, KERN_ERR, fmt: "error: couldn't mount because of " |
936 | "unsupported optional features (%x)" , |
937 | le32_to_cpu(features)); |
938 | goto failed_mount; |
939 | } |
940 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
941 | ext2_msg(sb, KERN_ERR, fmt: "error: couldn't mount RDWR because of " |
942 | "unsupported optional features (%x)" , |
943 | le32_to_cpu(features)); |
944 | goto failed_mount; |
945 | } |
946 | |
947 | if (le32_to_cpu(es->s_log_block_size) > |
948 | (EXT2_MAX_BLOCK_LOG_SIZE - BLOCK_SIZE_BITS)) { |
949 | ext2_msg(sb, KERN_ERR, |
950 | fmt: "Invalid log block size: %u" , |
951 | le32_to_cpu(es->s_log_block_size)); |
952 | goto failed_mount; |
953 | } |
954 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
955 | |
956 | if (test_opt(sb, DAX)) { |
957 | if (!sbi->s_daxdev) { |
958 | ext2_msg(sb, KERN_ERR, |
959 | fmt: "DAX unsupported by block device. Turning off DAX." ); |
960 | clear_opt(sbi->s_mount_opt, DAX); |
961 | } else if (blocksize != PAGE_SIZE) { |
962 | ext2_msg(sb, KERN_ERR, fmt: "unsupported blocksize for DAX\n" ); |
963 | clear_opt(sbi->s_mount_opt, DAX); |
964 | } |
965 | } |
966 | |
967 | /* If the blocksize doesn't match, re-read the thing.. */ |
968 | if (sb->s_blocksize != blocksize) { |
969 | brelse(bh); |
970 | |
971 | if (!sb_set_blocksize(sb, blocksize)) { |
972 | ext2_msg(sb, KERN_ERR, |
973 | fmt: "error: bad blocksize %d" , blocksize); |
974 | goto failed_sbi; |
975 | } |
976 | |
977 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
978 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
979 | bh = sb_bread(sb, block: logic_sb_block); |
980 | if(!bh) { |
981 | ext2_msg(sb, KERN_ERR, fmt: "error: couldn't read" |
982 | "superblock on 2nd try" ); |
983 | goto failed_sbi; |
984 | } |
985 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
986 | sbi->s_es = es; |
987 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
988 | ext2_msg(sb, KERN_ERR, fmt: "error: magic mismatch" ); |
989 | goto failed_mount; |
990 | } |
991 | } |
992 | |
993 | sb->s_maxbytes = ext2_max_size(bits: sb->s_blocksize_bits); |
994 | sb->s_max_links = EXT2_LINK_MAX; |
995 | sb->s_time_min = S32_MIN; |
996 | sb->s_time_max = S32_MAX; |
997 | |
998 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
999 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
1000 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
1001 | } else { |
1002 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
1003 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
1004 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
1005 | !is_power_of_2(n: sbi->s_inode_size) || |
1006 | (sbi->s_inode_size > blocksize)) { |
1007 | ext2_msg(sb, KERN_ERR, |
1008 | fmt: "error: unsupported inode size: %d" , |
1009 | sbi->s_inode_size); |
1010 | goto failed_mount; |
1011 | } |
1012 | } |
1013 | |
1014 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
1015 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
1016 | |
1017 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
1018 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1019 | goto cantfind_ext2; |
1020 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
1021 | sbi->s_inodes_per_block; |
1022 | sbi->s_desc_per_block = sb->s_blocksize / |
1023 | sizeof (struct ext2_group_desc); |
1024 | sbi->s_sbh = bh; |
1025 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
1026 | sbi->s_addr_per_block_bits = |
1027 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1028 | sbi->s_desc_per_block_bits = |
1029 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1030 | |
1031 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
1032 | goto cantfind_ext2; |
1033 | |
1034 | if (sb->s_blocksize != bh->b_size) { |
1035 | if (!silent) |
1036 | ext2_msg(sb, KERN_ERR, fmt: "error: unsupported blocksize" ); |
1037 | goto failed_mount; |
1038 | } |
1039 | |
1040 | if (es->s_log_frag_size != es->s_log_block_size) { |
1041 | ext2_msg(sb, KERN_ERR, |
1042 | fmt: "error: fragsize log %u != blocksize log %u" , |
1043 | le32_to_cpu(es->s_log_frag_size), sb->s_blocksize_bits); |
1044 | goto failed_mount; |
1045 | } |
1046 | |
1047 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
1048 | ext2_msg(sb, KERN_ERR, |
1049 | fmt: "error: #blocks per group too big: %lu" , |
1050 | sbi->s_blocks_per_group); |
1051 | goto failed_mount; |
1052 | } |
1053 | /* At least inode table, bitmaps, and sb have to fit in one group */ |
1054 | if (sbi->s_blocks_per_group <= sbi->s_itb_per_group + 3) { |
1055 | ext2_msg(sb, KERN_ERR, |
1056 | fmt: "error: #blocks per group smaller than metadata size: %lu <= %lu" , |
1057 | sbi->s_blocks_per_group, sbi->s_inodes_per_group + 3); |
1058 | goto failed_mount; |
1059 | } |
1060 | if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || |
1061 | sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
1062 | ext2_msg(sb, KERN_ERR, |
1063 | fmt: "error: invalid #inodes per group: %lu" , |
1064 | sbi->s_inodes_per_group); |
1065 | goto failed_mount; |
1066 | } |
1067 | if (sb_bdev_nr_blocks(sb) < le32_to_cpu(es->s_blocks_count)) { |
1068 | ext2_msg(sb, KERN_ERR, |
1069 | fmt: "bad geometry: block count %u exceeds size of device (%u blocks)" , |
1070 | le32_to_cpu(es->s_blocks_count), |
1071 | (unsigned)sb_bdev_nr_blocks(sb)); |
1072 | goto failed_mount; |
1073 | } |
1074 | |
1075 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1076 | le32_to_cpu(es->s_first_data_block) - 1) |
1077 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; |
1078 | if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group != |
1079 | le32_to_cpu(es->s_inodes_count)) { |
1080 | ext2_msg(sb, KERN_ERR, fmt: "error: invalid #inodes: %u vs computed %llu" , |
1081 | le32_to_cpu(es->s_inodes_count), |
1082 | (u64)sbi->s_groups_count * sbi->s_inodes_per_group); |
1083 | goto failed_mount; |
1084 | } |
1085 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1086 | EXT2_DESC_PER_BLOCK(sb); |
1087 | sbi->s_group_desc = kvmalloc_array(n: db_count, |
1088 | size: sizeof(struct buffer_head *), |
1089 | GFP_KERNEL); |
1090 | if (sbi->s_group_desc == NULL) { |
1091 | ret = -ENOMEM; |
1092 | ext2_msg(sb, KERN_ERR, fmt: "error: not enough memory" ); |
1093 | goto failed_mount; |
1094 | } |
1095 | bgl_lock_init(bgl: sbi->s_blockgroup_lock); |
1096 | sbi->s_debts = kcalloc(n: sbi->s_groups_count, size: sizeof(*sbi->s_debts), GFP_KERNEL); |
1097 | if (!sbi->s_debts) { |
1098 | ret = -ENOMEM; |
1099 | ext2_msg(sb, KERN_ERR, fmt: "error: not enough memory" ); |
1100 | goto failed_mount_group_desc; |
1101 | } |
1102 | for (i = 0; i < db_count; i++) { |
1103 | block = descriptor_loc(sb, logic_sb_block, nr: i); |
1104 | sbi->s_group_desc[i] = sb_bread(sb, block); |
1105 | if (!sbi->s_group_desc[i]) { |
1106 | for (j = 0; j < i; j++) |
1107 | brelse (bh: sbi->s_group_desc[j]); |
1108 | ext2_msg(sb, KERN_ERR, |
1109 | fmt: "error: unable to read group descriptors" ); |
1110 | goto failed_mount_group_desc; |
1111 | } |
1112 | } |
1113 | if (!ext2_check_descriptors (sb)) { |
1114 | ext2_msg(sb, KERN_ERR, fmt: "group descriptors corrupted" ); |
1115 | goto failed_mount2; |
1116 | } |
1117 | sbi->s_gdb_count = db_count; |
1118 | get_random_bytes(buf: &sbi->s_next_generation, len: sizeof(u32)); |
1119 | spin_lock_init(&sbi->s_next_gen_lock); |
1120 | |
1121 | /* per filesystem reservation list head & lock */ |
1122 | spin_lock_init(&sbi->s_rsv_window_lock); |
1123 | sbi->s_rsv_window_root = RB_ROOT; |
1124 | /* |
1125 | * Add a single, static dummy reservation to the start of the |
1126 | * reservation window list --- it gives us a placeholder for |
1127 | * append-at-start-of-list which makes the allocation logic |
1128 | * _much_ simpler. |
1129 | */ |
1130 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
1131 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
1132 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
1133 | sbi->s_rsv_window_head.rsv_goal_size = 0; |
1134 | ext2_rsv_window_add(sb, rsv: &sbi->s_rsv_window_head); |
1135 | |
1136 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
1137 | ext2_count_free_blocks(sb), GFP_KERNEL); |
1138 | if (!err) { |
1139 | err = percpu_counter_init(&sbi->s_freeinodes_counter, |
1140 | ext2_count_free_inodes(sb), GFP_KERNEL); |
1141 | } |
1142 | if (!err) { |
1143 | err = percpu_counter_init(&sbi->s_dirs_counter, |
1144 | ext2_count_dirs(sb), GFP_KERNEL); |
1145 | } |
1146 | if (err) { |
1147 | ret = err; |
1148 | ext2_msg(sb, KERN_ERR, fmt: "error: insufficient memory" ); |
1149 | goto failed_mount3; |
1150 | } |
1151 | |
1152 | #ifdef CONFIG_EXT2_FS_XATTR |
1153 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
1154 | if (!sbi->s_ea_block_cache) { |
1155 | ret = -ENOMEM; |
1156 | ext2_msg(sb, KERN_ERR, fmt: "Failed to create ea_block_cache" ); |
1157 | goto failed_mount3; |
1158 | } |
1159 | #endif |
1160 | /* |
1161 | * set up enough so that it can read an inode |
1162 | */ |
1163 | sb->s_op = &ext2_sops; |
1164 | sb->s_export_op = &ext2_export_ops; |
1165 | sb->s_xattr = ext2_xattr_handlers; |
1166 | |
1167 | #ifdef CONFIG_QUOTA |
1168 | sb->dq_op = &dquot_operations; |
1169 | sb->s_qcop = &ext2_quotactl_ops; |
1170 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
1171 | #endif |
1172 | |
1173 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1174 | if (IS_ERR(ptr: root)) { |
1175 | ret = PTR_ERR(ptr: root); |
1176 | goto failed_mount3; |
1177 | } |
1178 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
1179 | iput(root); |
1180 | ext2_msg(sb, KERN_ERR, fmt: "error: corrupt root inode, run e2fsck" ); |
1181 | goto failed_mount3; |
1182 | } |
1183 | |
1184 | sb->s_root = d_make_root(root); |
1185 | if (!sb->s_root) { |
1186 | ext2_msg(sb, KERN_ERR, fmt: "error: get root inode failed" ); |
1187 | ret = -ENOMEM; |
1188 | goto failed_mount3; |
1189 | } |
1190 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
1191 | ext2_msg(sb, KERN_WARNING, |
1192 | fmt: "warning: mounting ext3 filesystem as ext2" ); |
1193 | if (ext2_setup_super (sb, es, read_only: sb_rdonly(sb))) |
1194 | sb->s_flags |= SB_RDONLY; |
1195 | ext2_write_super(sb); |
1196 | return 0; |
1197 | |
1198 | cantfind_ext2: |
1199 | if (!silent) |
1200 | ext2_msg(sb, KERN_ERR, |
1201 | fmt: "error: can't find an ext2 filesystem on dev %s." , |
1202 | sb->s_id); |
1203 | goto failed_mount; |
1204 | failed_mount3: |
1205 | ext2_xattr_destroy_cache(cache: sbi->s_ea_block_cache); |
1206 | percpu_counter_destroy(fbc: &sbi->s_freeblocks_counter); |
1207 | percpu_counter_destroy(fbc: &sbi->s_freeinodes_counter); |
1208 | percpu_counter_destroy(fbc: &sbi->s_dirs_counter); |
1209 | failed_mount2: |
1210 | for (i = 0; i < db_count; i++) |
1211 | brelse(bh: sbi->s_group_desc[i]); |
1212 | failed_mount_group_desc: |
1213 | kvfree(addr: sbi->s_group_desc); |
1214 | kfree(objp: sbi->s_debts); |
1215 | failed_mount: |
1216 | brelse(bh); |
1217 | failed_sbi: |
1218 | fs_put_dax(dax_dev: sbi->s_daxdev, NULL); |
1219 | sb->s_fs_info = NULL; |
1220 | kfree(objp: sbi->s_blockgroup_lock); |
1221 | kfree(objp: sbi); |
1222 | return ret; |
1223 | } |
1224 | |
1225 | static void ext2_clear_super_error(struct super_block *sb) |
1226 | { |
1227 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; |
1228 | |
1229 | if (buffer_write_io_error(bh: sbh)) { |
1230 | /* |
1231 | * Oh, dear. A previous attempt to write the |
1232 | * superblock failed. This could happen because the |
1233 | * USB device was yanked out. Or it could happen to |
1234 | * be a transient write error and maybe the block will |
1235 | * be remapped. Nothing we can do but to retry the |
1236 | * write and hope for the best. |
1237 | */ |
1238 | ext2_msg(sb, KERN_ERR, |
1239 | fmt: "previous I/O error to superblock detected" ); |
1240 | clear_buffer_write_io_error(bh: sbh); |
1241 | set_buffer_uptodate(sbh); |
1242 | } |
1243 | } |
1244 | |
1245 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1246 | int wait) |
1247 | { |
1248 | ext2_clear_super_error(sb); |
1249 | spin_lock(lock: &EXT2_SB(sb)->s_lock); |
1250 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1251 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
1252 | es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); |
1253 | /* unlock before we do IO */ |
1254 | spin_unlock(lock: &EXT2_SB(sb)->s_lock); |
1255 | mark_buffer_dirty(bh: EXT2_SB(sb)->s_sbh); |
1256 | if (wait) |
1257 | sync_dirty_buffer(bh: EXT2_SB(sb)->s_sbh); |
1258 | } |
1259 | |
1260 | /* |
1261 | * In the second extended file system, it is not necessary to |
1262 | * write the super block since we use a mapping of the |
1263 | * disk super block in a buffer. |
1264 | * |
1265 | * However, this function is still used to set the fs valid |
1266 | * flags to 0. We need to set this flag to 0 since the fs |
1267 | * may have been checked while mounted and e2fsck may have |
1268 | * set s_state to EXT2_VALID_FS after some corrections. |
1269 | */ |
1270 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1271 | { |
1272 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1273 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1274 | |
1275 | /* |
1276 | * Write quota structures to quota file, sync_blockdev() will write |
1277 | * them to disk later |
1278 | */ |
1279 | dquot_writeback_dquots(sb, type: -1); |
1280 | |
1281 | spin_lock(lock: &sbi->s_lock); |
1282 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1283 | ext2_debug("setting valid to 0\n" ); |
1284 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); |
1285 | } |
1286 | spin_unlock(lock: &sbi->s_lock); |
1287 | ext2_sync_super(sb, es, wait); |
1288 | return 0; |
1289 | } |
1290 | |
1291 | static int ext2_freeze(struct super_block *sb) |
1292 | { |
1293 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1294 | |
1295 | /* |
1296 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared |
1297 | * because we have unattached inodes and thus filesystem is not fully |
1298 | * consistent. |
1299 | */ |
1300 | if (atomic_long_read(v: &sb->s_remove_count)) { |
1301 | ext2_sync_fs(sb, wait: 1); |
1302 | return 0; |
1303 | } |
1304 | /* Set EXT2_FS_VALID flag */ |
1305 | spin_lock(lock: &sbi->s_lock); |
1306 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); |
1307 | spin_unlock(lock: &sbi->s_lock); |
1308 | ext2_sync_super(sb, es: sbi->s_es, wait: 1); |
1309 | |
1310 | return 0; |
1311 | } |
1312 | |
1313 | static int ext2_unfreeze(struct super_block *sb) |
1314 | { |
1315 | /* Just write sb to clear EXT2_VALID_FS flag */ |
1316 | ext2_write_super(sb); |
1317 | |
1318 | return 0; |
1319 | } |
1320 | |
1321 | static void ext2_write_super(struct super_block *sb) |
1322 | { |
1323 | if (!sb_rdonly(sb)) |
1324 | ext2_sync_fs(sb, wait: 1); |
1325 | } |
1326 | |
1327 | static int ext2_remount (struct super_block * sb, int * flags, char * data) |
1328 | { |
1329 | struct ext2_sb_info * sbi = EXT2_SB(sb); |
1330 | struct ext2_super_block * es; |
1331 | struct ext2_mount_options new_opts; |
1332 | int err; |
1333 | |
1334 | sync_filesystem(sb); |
1335 | |
1336 | spin_lock(lock: &sbi->s_lock); |
1337 | new_opts.s_mount_opt = sbi->s_mount_opt; |
1338 | new_opts.s_resuid = sbi->s_resuid; |
1339 | new_opts.s_resgid = sbi->s_resgid; |
1340 | spin_unlock(lock: &sbi->s_lock); |
1341 | |
1342 | if (!parse_options(options: data, sb, opts: &new_opts)) |
1343 | return -EINVAL; |
1344 | |
1345 | spin_lock(lock: &sbi->s_lock); |
1346 | es = sbi->s_es; |
1347 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
1348 | ext2_msg(sb, KERN_WARNING, fmt: "warning: refusing change of " |
1349 | "dax flag with busy inodes while remounting" ); |
1350 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
1351 | } |
1352 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
1353 | goto out_set; |
1354 | if (*flags & SB_RDONLY) { |
1355 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
1356 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
1357 | goto out_set; |
1358 | |
1359 | /* |
1360 | * OK, we are remounting a valid rw partition rdonly, so set |
1361 | * the rdonly flag and then mark the partition as valid again. |
1362 | */ |
1363 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
1364 | es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); |
1365 | spin_unlock(lock: &sbi->s_lock); |
1366 | |
1367 | err = dquot_suspend(sb, type: -1); |
1368 | if (err < 0) |
1369 | return err; |
1370 | |
1371 | ext2_sync_super(sb, es, wait: 1); |
1372 | } else { |
1373 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
1374 | ~EXT2_FEATURE_RO_COMPAT_SUPP); |
1375 | if (ret) { |
1376 | spin_unlock(lock: &sbi->s_lock); |
1377 | ext2_msg(sb, KERN_WARNING, |
1378 | fmt: "warning: couldn't remount RDWR because of " |
1379 | "unsupported optional features (%x)." , |
1380 | le32_to_cpu(ret)); |
1381 | return -EROFS; |
1382 | } |
1383 | /* |
1384 | * Mounting a RDONLY partition read-write, so reread and |
1385 | * store the current valid flag. (It may have been changed |
1386 | * by e2fsck since we originally mounted the partition.) |
1387 | */ |
1388 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
1389 | if (!ext2_setup_super (sb, es, read_only: 0)) |
1390 | sb->s_flags &= ~SB_RDONLY; |
1391 | spin_unlock(lock: &sbi->s_lock); |
1392 | |
1393 | ext2_write_super(sb); |
1394 | |
1395 | dquot_resume(sb, type: -1); |
1396 | } |
1397 | |
1398 | spin_lock(lock: &sbi->s_lock); |
1399 | out_set: |
1400 | sbi->s_mount_opt = new_opts.s_mount_opt; |
1401 | sbi->s_resuid = new_opts.s_resuid; |
1402 | sbi->s_resgid = new_opts.s_resgid; |
1403 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1404 | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
1405 | spin_unlock(lock: &sbi->s_lock); |
1406 | |
1407 | return 0; |
1408 | } |
1409 | |
1410 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1411 | { |
1412 | struct super_block *sb = dentry->d_sb; |
1413 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1414 | struct ext2_super_block *es = sbi->s_es; |
1415 | |
1416 | spin_lock(lock: &sbi->s_lock); |
1417 | |
1418 | if (test_opt (sb, MINIX_DF)) |
1419 | sbi->s_overhead_last = 0; |
1420 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
1421 | unsigned long i, overhead = 0; |
1422 | smp_rmb(); |
1423 | |
1424 | /* |
1425 | * Compute the overhead (FS structures). This is constant |
1426 | * for a given filesystem unless the number of block groups |
1427 | * changes so we cache the previous value until it does. |
1428 | */ |
1429 | |
1430 | /* |
1431 | * All of the blocks before first_data_block are |
1432 | * overhead |
1433 | */ |
1434 | overhead = le32_to_cpu(es->s_first_data_block); |
1435 | |
1436 | /* |
1437 | * Add the overhead attributed to the superblock and |
1438 | * block group descriptors. If the sparse superblocks |
1439 | * feature is turned on, then not all groups have this. |
1440 | */ |
1441 | for (i = 0; i < sbi->s_groups_count; i++) |
1442 | overhead += ext2_bg_has_super(sb, group: i) + |
1443 | ext2_bg_num_gdb(sb, group: i); |
1444 | |
1445 | /* |
1446 | * Every block group has an inode bitmap, a block |
1447 | * bitmap, and an inode table. |
1448 | */ |
1449 | overhead += (sbi->s_groups_count * |
1450 | (2 + sbi->s_itb_per_group)); |
1451 | sbi->s_overhead_last = overhead; |
1452 | smp_wmb(); |
1453 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
1454 | } |
1455 | |
1456 | buf->f_type = EXT2_SUPER_MAGIC; |
1457 | buf->f_bsize = sb->s_blocksize; |
1458 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1459 | buf->f_bfree = ext2_count_free_blocks(sb); |
1460 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
1461 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1462 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
1463 | buf->f_bavail = 0; |
1464 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1465 | buf->f_ffree = ext2_count_free_inodes(sb); |
1466 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1467 | buf->f_namelen = EXT2_NAME_LEN; |
1468 | buf->f_fsid = uuid_to_fsid(uuid: es->s_uuid); |
1469 | spin_unlock(lock: &sbi->s_lock); |
1470 | return 0; |
1471 | } |
1472 | |
1473 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1474 | int flags, const char *dev_name, void *data) |
1475 | { |
1476 | return mount_bdev(fs_type, flags, dev_name, data, fill_super: ext2_fill_super); |
1477 | } |
1478 | |
1479 | #ifdef CONFIG_QUOTA |
1480 | |
1481 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
1482 | * acquiring the locks... As quota files are never truncated and quota code |
1483 | * itself serializes the operations (and no one else should touch the files) |
1484 | * we don't have to be afraid of races */ |
1485 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
1486 | size_t len, loff_t off) |
1487 | { |
1488 | struct inode *inode = sb_dqopt(sb)->files[type]; |
1489 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
1490 | int err = 0; |
1491 | int offset = off & (sb->s_blocksize - 1); |
1492 | int tocopy; |
1493 | size_t toread; |
1494 | struct buffer_head tmp_bh; |
1495 | struct buffer_head *bh; |
1496 | loff_t i_size = i_size_read(inode); |
1497 | |
1498 | if (off > i_size) |
1499 | return 0; |
1500 | if (off+len > i_size) |
1501 | len = i_size-off; |
1502 | toread = len; |
1503 | while (toread > 0) { |
1504 | tocopy = min_t(size_t, sb->s_blocksize - offset, toread); |
1505 | |
1506 | tmp_bh.b_state = 0; |
1507 | tmp_bh.b_size = sb->s_blocksize; |
1508 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
1509 | if (err < 0) |
1510 | return err; |
1511 | if (!buffer_mapped(bh: &tmp_bh)) /* A hole? */ |
1512 | memset(data, 0, tocopy); |
1513 | else { |
1514 | bh = sb_bread(sb, block: tmp_bh.b_blocknr); |
1515 | if (!bh) |
1516 | return -EIO; |
1517 | memcpy(data, bh->b_data+offset, tocopy); |
1518 | brelse(bh); |
1519 | } |
1520 | offset = 0; |
1521 | toread -= tocopy; |
1522 | data += tocopy; |
1523 | blk++; |
1524 | } |
1525 | return len; |
1526 | } |
1527 | |
1528 | /* Write to quotafile */ |
1529 | static ssize_t ext2_quota_write(struct super_block *sb, int type, |
1530 | const char *data, size_t len, loff_t off) |
1531 | { |
1532 | struct inode *inode = sb_dqopt(sb)->files[type]; |
1533 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
1534 | int err = 0; |
1535 | int offset = off & (sb->s_blocksize - 1); |
1536 | int tocopy; |
1537 | size_t towrite = len; |
1538 | struct buffer_head tmp_bh; |
1539 | struct buffer_head *bh; |
1540 | |
1541 | while (towrite > 0) { |
1542 | tocopy = min_t(size_t, sb->s_blocksize - offset, towrite); |
1543 | |
1544 | tmp_bh.b_state = 0; |
1545 | tmp_bh.b_size = sb->s_blocksize; |
1546 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
1547 | if (err < 0) |
1548 | goto out; |
1549 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
1550 | bh = sb_bread(sb, block: tmp_bh.b_blocknr); |
1551 | else |
1552 | bh = sb_getblk(sb, block: tmp_bh.b_blocknr); |
1553 | if (unlikely(!bh)) { |
1554 | err = -EIO; |
1555 | goto out; |
1556 | } |
1557 | lock_buffer(bh); |
1558 | memcpy(bh->b_data+offset, data, tocopy); |
1559 | flush_dcache_page(page: bh->b_page); |
1560 | set_buffer_uptodate(bh); |
1561 | mark_buffer_dirty(bh); |
1562 | unlock_buffer(bh); |
1563 | brelse(bh); |
1564 | offset = 0; |
1565 | towrite -= tocopy; |
1566 | data += tocopy; |
1567 | blk++; |
1568 | } |
1569 | out: |
1570 | if (len == towrite) |
1571 | return err; |
1572 | if (inode->i_size < off+len-towrite) |
1573 | i_size_write(inode, i_size: off+len-towrite); |
1574 | inode_inc_iversion(inode); |
1575 | inode_set_mtime_to_ts(inode, ts: inode_set_ctime_current(inode)); |
1576 | mark_inode_dirty(inode); |
1577 | return len - towrite; |
1578 | } |
1579 | |
1580 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
1581 | const struct path *path) |
1582 | { |
1583 | int err; |
1584 | struct inode *inode; |
1585 | |
1586 | err = dquot_quota_on(sb, type, format_id, path); |
1587 | if (err) |
1588 | return err; |
1589 | |
1590 | inode = d_inode(dentry: path->dentry); |
1591 | inode_lock(inode); |
1592 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; |
1593 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, |
1594 | S_NOATIME | S_IMMUTABLE); |
1595 | inode_unlock(inode); |
1596 | mark_inode_dirty(inode); |
1597 | |
1598 | return 0; |
1599 | } |
1600 | |
1601 | static int ext2_quota_off(struct super_block *sb, int type) |
1602 | { |
1603 | struct inode *inode = sb_dqopt(sb)->files[type]; |
1604 | int err; |
1605 | |
1606 | if (!inode || !igrab(inode)) |
1607 | goto out; |
1608 | |
1609 | err = dquot_quota_off(sb, type); |
1610 | if (err) |
1611 | goto out_put; |
1612 | |
1613 | inode_lock(inode); |
1614 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); |
1615 | inode_set_flags(inode, flags: 0, S_NOATIME | S_IMMUTABLE); |
1616 | inode_unlock(inode); |
1617 | mark_inode_dirty(inode); |
1618 | out_put: |
1619 | iput(inode); |
1620 | return err; |
1621 | out: |
1622 | return dquot_quota_off(sb, type); |
1623 | } |
1624 | |
1625 | #endif |
1626 | |
1627 | static struct file_system_type ext2_fs_type = { |
1628 | .owner = THIS_MODULE, |
1629 | .name = "ext2" , |
1630 | .mount = ext2_mount, |
1631 | .kill_sb = kill_block_super, |
1632 | .fs_flags = FS_REQUIRES_DEV, |
1633 | }; |
1634 | MODULE_ALIAS_FS("ext2" ); |
1635 | |
1636 | static int __init init_ext2_fs(void) |
1637 | { |
1638 | int err; |
1639 | |
1640 | err = init_inodecache(); |
1641 | if (err) |
1642 | return err; |
1643 | err = register_filesystem(&ext2_fs_type); |
1644 | if (err) |
1645 | goto out; |
1646 | return 0; |
1647 | out: |
1648 | destroy_inodecache(); |
1649 | return err; |
1650 | } |
1651 | |
1652 | static void __exit exit_ext2_fs(void) |
1653 | { |
1654 | unregister_filesystem(&ext2_fs_type); |
1655 | destroy_inodecache(); |
1656 | } |
1657 | |
1658 | MODULE_AUTHOR("Remy Card and others" ); |
1659 | MODULE_DESCRIPTION("Second Extended Filesystem" ); |
1660 | MODULE_LICENSE("GPL" ); |
1661 | module_init(init_ext2_fs) |
1662 | module_exit(exit_ext2_fs) |
1663 | |